کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4741682 | 1641509 | 2014 | 4 صفحه PDF | دانلود رایگان |
• Electrical conductivity of hydrated olivine decreases with oxygen fugacity.
• Conduction by the most abundant defect is inconsistent with this observation.
• Conduction by minor defect is consistent with this observation.
Various mechanisms of hydrogen-assisted electrical conductivity predict different dependence of conductivity on oxygen fugacity. If a majority of hydrogen-related defects (i.e., two protons at M-site) carries the electrical current, then the conductivity will be independent of oxygen fugacity, whereas if a minority defect such as free proton carries the electrical conductivity, then the electrical conductivity will decrease with oxygen fugacity. We have determined the dependence of hydrogen-assisted electrical conductivity on oxygen fugacity in hydrous olivine. We found that the hydrogen-assisted electrical conductivity in olivine decreases with oxygen fugacity. This result supports a model where hydrogen-related defect with minor concentration (e.g., free proton or one hydrogen at M-site) carries most of the electric charge.
Journal: Physics of the Earth and Planetary Interiors - Volume 232, July 2014, Pages 57–60